package com.qcby.front.config;

import com.alibaba.fastjson.JSON;
import com.qcby.framwork.utils.AppHttpCodeEnum;
import com.qcby.framwork.utils.ResponseResult;
import com.qcby.front.model.LoginUser;
import com.qcby.front.utils.JwtUtil;
import com.qcby.front.utils.RedisCache;
import com.qcby.front.utils.WebUtils;
import io.jsonwebtoken.Claims;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.security.authentication.UsernamePasswordAuthenticationToken;
import org.springframework.security.core.context.SecurityContextHolder;
import org.springframework.stereotype.Component;
import org.springframework.util.StringUtils;
import org.springframework.web.filter.OncePerRequestFilter;

import javax.servlet.FilterChain;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.util.Objects;

@Component
public class JwtAuthenticationTokenFilter extends OncePerRequestFilter {
    @Autowired
    private RedisCache redisCache;
    @Override
    protected void doFilterInternal(HttpServletRequest request,
                                    HttpServletResponse response, FilterChain filterChain) throws ServletException,
            IOException {
//获取请求头中的token
        String token = request.getHeader("token");

        // 获取请求的 URI
        String requestURI = request.getRequestURI();
// 如果是登录接口，跳过 JWT 过滤器
        if ("/login".equals(requestURI)) {
            filterChain.doFilter(request, response);
            return;
        }
        //检查token不为空
        if(!StringUtils.hasText(token)){
//说明该接口不需要登录 直接放行
            filterChain.doFilter(request, response);
            return;
        }
//解析获取userid
        Claims claims = null;
        try {
            claims = JwtUtil.parseJWT(token);
        } catch (Exception e) {
            e.printStackTrace();
//token超时 token非法
//响应告诉前端需要重新登录
            ResponseResult result =
                    ResponseResult.errorResult(AppHttpCodeEnum.NEED_LOGIN);
            WebUtils.renderString(response, JSON.toJSONString(result));
            return;
        }
        String userId = claims.getSubject();
//从redis中获取用户信息
        LoginUser loginUser = redisCache.getCacheObject("bloglogin:" + userId);
//如果获取不到
        if(Objects.isNull(loginUser)){
//说明登录过期 提示重新登录
            ResponseResult result =
                    ResponseResult.errorResult(AppHttpCodeEnum.NEED_LOGIN);
            WebUtils.renderString(response, JSON.toJSONString(result));
            return;
        }
//存入SecurityContextHolder
        UsernamePasswordAuthenticationToken authenticationToken = new
                UsernamePasswordAuthenticationToken(loginUser,null,null);
        SecurityContextHolder.getContext().setAuthentication(authenticationToken);
        filterChain.doFilter(request, response);
    }
}
